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In the 1st question, when we solve for option 2, it gives us the value of xy 48 & -48, isn't it insufficient? As we don't know one value of xy?
Yes exactly i have the same doubt
it A not D
The answer should be A, not D
@@lingwang1986 Yes the answer is A and not D
Hy cant the answer be (B) b²- a²/2. Why did you have to negate the b equation and not the a?
For question #4: why can't we plug in the 2 to the equation 3a - 2b?
Even if you do, you still don't know anything about b, therefore statement 2 is not sufficient.
I prefer liquid ink to refill my markers. And you should too!
In the 1st question, when we solve for option 2, it gives us the value of xy 48 & -48, isn't it insufficient? As we don't know one value of xy?
Yes exactly i have the same doubt
it A not D
The answer should be A, not D
@@lingwang1986 Yes the answer is A and not D
Hy cant the answer be (B) b²- a²/2. Why did you have to negate the b equation and not the a?
For question #4: why can't we plug in the 2 to the equation 3a - 2b?
Even if you do, you still don't know anything about b, therefore statement 2 is not sufficient.
I prefer liquid ink to refill my markers. And you should too!